Improvement in dies for forging hammers



UNITED STATES PATENT OFFICE.

THOMAS DAEFIN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HIM- SELF ANDWILLIAM BALDWIN, OE SAME PLAGE.

IMPROVEMENT IN DIES FOR FORGING HMMERS.

Specification forming part of Letters Patent No. 143,406, dated October7, 1873; application led August 29, 1873.

To all whom fit may concern:

Be it known that I, TrioMAs DAEEIN, of the city of Philadelphia, in theState of Pennsylvania, have invented a new and Improved Die for SwagingHammers and kindred articles, and I do hereby declare the following tobe a full, clear, and exact descriptionthereof, reference being had tothe accompanying drawings making part of this specification, in which-Figure l is a plan of the lower half of the die. Fig. 2 is a perspectiveview of the upper and pieces of the die placed together.

My invention has for its object to produce a die which will clear itselfof scale.

Heretofore dies have been made of the character named, so that theportion of the die making the round head and the eye portion have beencavities in the die, forming a complete chamber when the two halvesofthe die are brought together. In the lower half of this chamber scalecollects as the metal is being struck up, and it is diflicult to removeit without removing the die. At any rate, the scale has to be removed,and the die will not clear itself of scale by the metal forcing it outof the way, and as a result bad work or uneven surfaces are produced bythe scale indenting the metal to be swaged. All this my inventionovercomes; and it consists in a die having a transverse opening in aline with the portion of the die forming the eye portion of the hammer,and in leaving the end of the die forming the round head open, so as toallow it to clear itself of all scale by the metal pressing it out.

In order that those skilled in the art may make and use my invention, Iwill proceed to describe the manner in which I have carried it out.

In the said drawings, A is the lower half or bed piece of the die. Theupper half corresponds to it in all respects. The portion into which thesteel bar is fed, and which forms the plane-faced portion of the hammer,is shown at ai, the metal being contracted to form a neck at a'. Agroove, bequal in the piece A to the diameter of one-half of the bulb toform the eye-piece of the hammer, rims transverse the line of thehammer, and has its ends opening at c.

When the upper portion of the die descends the heated metal fills intothe matrix and forces out any scale that may lie in the eye portion ofthe matrix, and it escapes at the openings c. So it is with theround-headed portion. The metal being forced into the portion of thematrix marked e, the scale is expressed toward the opening t', therebyleaving the matrix free from any scale to indent or de stroy the surfaceof the metal being swaged.

These dies may be used in any machine for swagin g metals, whetheroperating by percussive blows or by pressure.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

A die for swaging hammers, constructed as described, and having theportions a and e separated by the open transverse -groove I), for thereception of the eye portion of the hammer, substantially as and for thepurpose set forth.

RUTLEDGE WILLsoN, JAMES H. MANDEvrLLE.

